Mandrel



J. DI PALMA June 19, 1951 MANDREL 2 Sheets-Sheet 1 Filed Dec. 28, 1949INVENTOR.

' JOSEPH DI PALMA ATTORNEY Patented June 19, 1951 MANDREL Joseph DiPalma, Fairfield County, Cnn., as-

signor to Dominick Di Palma, Brooklyn, N. Y.

Application December 28, 1949, Serial No. 135,490

9 Claims.

This invention relates to improvements in mandrels for use in weavingand forming expansible and contractile cable grips, and has for aprincipal object the provision of a mandrel having a tubular body havingdetachably mounted thereon a plurality of annular rings, which form aworking fit on said body, and which are firmly secured to the tubularbody by means of screws or the like. Each ring carries a plurality ofradially projecting L-shaped pins or hooks which are welded or otherwisepermanently secured thereto.

Another object of the invention is the provision of a mandrel having atubular body with evenly spaced holes, to be engaged by screws, disposedalong one line thereon, and with like variably spaced holes disposedalong another line thereon spaced apart from the first mentioned line sothat the annular rings may be secured on the mandrel body in accordancewith the type of cable grip to be woven, screw holes in the rings beingso arranged that whether the rings are secured thereon by screwsengaging one row of holes or the other row of holes, or some holes inone row and some in the other, the pins or hooks on all of the rings arein rows parallel to the axis of the tubular body. This arrangementprovides the greatest flexibility, because the mandrel may be rapidlyset up for the weaving of constant mesh cable grips, variable mesh cablegrips, or for grips in which the mesh is combinational.

A further object of the invention is the provision of a cable gripmandrel which extends vertically from a fixed base, the portion withinsaid base being supported therein by frictionless bearings, therebyproviding free rotation, without end play for the mandrel, and greatlyfacilitating weaving operations.

Other objects will be apparent to those skilled in the art, upon a studyof this specification and the accompanying drawings.

Referring to the drawings which illustrate one embodiment of theinvention;

Figure l is an elevational view of a complete cable grip mandrel mountedin its base;

Figure 2 is an elevation of a portion of the'mandrel per se with aplurality of the annular ring members secured thereon for weavingvariable mesh cable grips;

Figure 3 is an elevation the same portion of the mandrel as seen fromthe right side of Figure 1, except that the annular ring members areevenly spaced thereon for weaving constant mesh cable Figure 4 is across-section taken along the lines 4-4 of Figure 3;

Figure 5 is an elevational view of the mandrel of Figure 3, showing aportion of a cable grip woven thereon;

Figure 6 is a sectional elevation of the base in which the mandrel ismounted;

Figure 7 is a cross-section similar to Figure 4, but showing a differentmeans for securing the ring member to the tubular mandrel body; and

Figure 8 is a view similar to Figure '7, showing yet another means forsecuring the ring memher to the tubular mandrel body.

Referring first to Figure 1 the mandrel ID has,

an extension H which is secured in the rotor H! of the base l3.

The mandrel it, referring to Figures 2 and 3, includes a tubular body 4having a series of tapped holes l5 therein along a vertical referenceline I6. These tapped holes are equally spaced along the reference linel6 and are to be used as will hereinafter be pointed out for setting themandrel up for the weaving of constant mesh cable grips.

In Figure 2 a second reference line I! is formed on the body l4, spaced60 with respect to the reference line It, and a series of tapped h0les|8are formed along this reference line and are Variablyspaced so that bythe use of these holes, the mandrel may be set up for weaving variablemesh cable grips.

In cases where combinations of constant mesh and variable mesh aredesired, some of the holes I5 will be used and some of the holes IS inaccordance with the requirements.

A plurality of annular ring members is provided for mounting on saidbody and designated by the numeral I9. Each rin member is comprised of asolid annulus 20 having closed holes therein to accommodate screws suchas screw 2| each of which engages the tapped holes I5 and/or l8. Rigidlysecured on each ring member 20 is a plurality of radially projectedgenerally L-shaped pins or hooks 55 which are welded or otherwisepermanently and rigidly secured thereto. These hooks are equally spacedcircumferentially about] the ring member and as stated before for con-"stant mesh weaving, the ring members are mounted on the body M with thescrews 2| engaging the holes l5 along the reference line It. As seengaging the tapped holes l8 along the reference line H.

Referring now to Figure 6 the base generally 3 designated by the numeral13 includes the flange base member 22 havin a boss 23 formed integrallytherewith and having a threaded counterbore 24 therein. A tubular member25 has its lower end externally threaded and engagin the threaded hole24. The tubular member 25 has a counterbore 26 formed thereinterminating in a shoulder 21 to accommodate the outer race 28 of a ballbearing 29 and this outer race is secured therein against the shoulderby a threaded ring 30 which engages threads 3| formed in the counterbore26. Below the threads 3| is formed a wider passage 32 to clear thethreads formed on the threaded ring 30.

At the upper end the tube 21 has a counterbore 33 formed therein andproviding a shoulder 34 against which the outer race 35 of a ballbearing 36 may rest. The counterbore 33 has a portion 31 which isenlarged and threaded and a threaded retaining ring 38 engages thesethreads and forces the outer race 35 against the shoulder 34. Retainingring 38 has a counterbore'39 which will be presently described.

A sleeve shaft 40 has a portion 4| on its lower end of reduced diameterand forming a shoulder 42 against which the inner race 43 of the ballbearing 29 rests and this inner race is secured thereon against theshoulder by means of a nut 44 engaging the threaded lower end of theportion 4!. nut 44 and the inner race 43. The upper end .of the sleeveshaft 40 has a portion 46 of reduced diameter providing a shoulder 4'!against which the inner race 48 of the ball bearing 36 may rest. Beyondthe inner race 48 the portion is provided with threads 49.

A sleeve member 58 has a central hole 5! therethrough to accommodate theextension H of the mandrel and opposing set screws 52 are provided forsecurin said extension in the hole 5!. The sleeve member has a threadedcounterbore 53 therein which engages the threads 49 and generally clampsthe inner race 48 against .the shoulder 41. The bore 39 in the member 38is sufiiciently larger than the exterior diameter of the sleeve member50 to permit the latter to rotate freely.

In the modification shown in Figure 7, the ring member 28 is providedwith tapped holes-53 which are engaged by the threaded shanks of screws54 A washer 45 is provided between the and the straight dowel shanks 56of the screws I'G-and l'i but'no holes are formed therein. In-

stead the point or tip 58 of the set screw 59 engages the body MD andretains the ring thereon.

Although I have herein shown anddescribed one embodiment of theinvention and two modifications thereof, it will be obvious to thoseskilled in the art that many changes may be made in the arrangementsherein shown and described withinthe scope of the appendedclaims.

What is claimed is:

l. .A mandrel upon which woven expansible and.contractible cable gripsare formed, comprising a cylindrical body, a plurality of ring memberscarried thereon in spaced relation ;to each-other, each ring carrying aplurality of hook members spaced apart from each other-thereon, andscrew means cooperatively engaging each ring and saidbody for:detachably retaining said rings on said body.

2. A mandrel upon which woven expansible and contractible cable gripsare formed, comprising, a cylindrical body mounted for rotation about avertical axis; a plurality of rings, each carrying a plurality ofequally spaced hook members; a vertical reference line formed on saidbody as a guide for indicating a predetermined spacing for said ringsand also as a guide to insure vertical alignment of said hooks, andindividual screws passing through said rings and engaging said body forrigidly mounting said rings thereon.

,3. A mandrel upon which woven expansible and contractible cable gripsare formed, comprising a cylindrical body adapted to be rotated about avertical axis as the weaving progresses, a series of radial holes formedin said body along a vertical line and spaced apart from each other in apredetermined order, a plurality of rings each forming a working fit onsaid mandrel and each carrying a plurality of equally spaced hookmembers and a screw hole between at least one pair of said hook members,and individual screws passing through the holes in said rings and eachengaging a radial hole in said body for securing said rings on said bodyin said predetermined order.

4. A mandrel according to claim 3, in which two series of said radialholes areoppositely disposed in said body, said holes being tapped, andin which each ring has clearance holes oppositely disposed therein,whereby each ring is rigidly secured on said body by two screws passingthrough the clearance holes therein and threads edly engaging saidtapped holes in said body.

5. A mandrel according to .claim 3, in which two series of said radialholes are disposed in said body in said predetermined order, in which asecond two series of radial holes are disposed in said body in adifierent order, all said holes being tapped, and in whicheach ringhasclearance holes oppositely disposed therein, whereby said rings maybe combinationally spaced on said body by securing some of them on bymeans of screws engaging tappedholes of one seriesand by means of otherscrews engaging tapped holes of the other series.

6. A mandrel upon which woven expansible and contractible cable gripsare formed, including, a cylindrical body carrying protuberances uponwhich the weaving may be effected, a base supporting said body forrotation about a vertical axis, and comprised of a flanged base member,an upstanding tubular extension secured thereto, a tubular shankcarrying spaced frictionless bearings positioned in said tubularextension, means within the latter engaging outer races of said bearingsfor retaining them and said tubular shank therein, and means forcentrally securing the lower end of said cylindrical body in saidtubular shank.

7. In a mandrel upon which woven expansible and contractible cablegripsare formed, a cylindrical body, and a plurality of rings detachablymounted thereon in predetermined spaced relation to each other, eachring being comprised of a web of material formed into a ring to form aworking fit on said body and carrying a plurality of hook members.

.8. In a mandrel upon which woven expansible and-contractible cablegrips are formed, a cylindrical body, a plurality of threaded holesformed in said body,-and -a plurality of rings detachab ly mountedthereon in predetermined spaced relaion to each other e chrrine be co red-9 a web of material formed into an annulus and welded to form aclosed ring, a plurality of hook members secured to said ring andpermanently secured thereon, and clearance holes to accommodate screwswhich engage corresponding ones of said threaded holes formed in saidcylindrical body.

9. In a mandrel upon which woven expansible and contractible cable gripsare formed, a cylindrical body, a plurality of rings detachably mountedthereon in predetermined spaced re- 10 No references cited.

